man it kinda depends on how hot she is...and how good she is at giving head...if she sucks...throw her a gram...if shes god all mighty at blowjobs, then i'd probably give her a quarter
I'd say on both ends a quarter has to be the fairest.. an eight?! if a girl is givin you a bj for 30-50 dollars worth then she's probably got the herps
Here's an idea...tell her you will determine the amount of weed she gets based on her performance. If you get tripleX service, including working the balls and ass along with good eye contact and calling you daddy, then hook her up LOL! If it's shitty, toothy head, then get her baked and tell her to get lost.